#include <stdio.h>

struct Book {
    char title[50];
    char author[50];
    char subject[100];
    int book_id;
} book = {"C 语言", "RUNOOB", "编程语言", 123456};

int main() {
    printf("title : %s\nauthor: %s\nsubject: %s\nbook_id: %d\n", book.title, book.author, book.subject, book.book_id);
}
